CN110619667B - PNG picture compression method and system - Google Patents
PNG picture compression method and system Download PDFInfo
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- CN110619667B CN110619667B CN201910922430.1A CN201910922430A CN110619667B CN 110619667 B CN110619667 B CN 110619667B CN 201910922430 A CN201910922430 A CN 201910922430A CN 110619667 B CN110619667 B CN 110619667B
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T7/00—Image analysis
- G06T7/90—Determination of colour characteristics
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T9/00—Image coding
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
- H04N19/10—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding
- H04N19/169—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the coding unit, i.e. the structural portion or semantic portion of the video signal being the object or the subject of the adaptive coding
- H04N19/17—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the coding unit, i.e. the structural portion or semantic portion of the video signal being the object or the subject of the adaptive coding the unit being an image region, e.g. an object
- H04N19/172—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the coding unit, i.e. the structural portion or semantic portion of the video signal being the object or the subject of the adaptive coding the unit being an image region, e.g. an object the region being a picture, frame or field
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
- H04N19/42—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals characterised by implementation details or hardware specially adapted for video compression or decompression, e.g. dedicated software implementation
- H04N19/423—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals characterised by implementation details or hardware specially adapted for video compression or decompression, e.g. dedicated software implementation characterised by memory arrangements
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Abstract
The application provides a PNG picture compression method and a system thereof, wherein the method comprises the following steps: receiving a PNG picture to be compressed; judging whether the received picture has an alpha channel, if so, acquiring a transparency value of the alpha channel, otherwise, terminating the flow; judging whether the received picture belongs to a picture which is allowed to be compressed or not according to the transparency value, if so, compressing the picture, otherwise, terminating the flow; the method for compressing the picture comprises the following steps: removing an alpha channel of the picture which is allowed to be compressed; and saving the PNG picture with the alpha channel removed. The method and the device have the advantage that the storage space occupied by the PNG picture is reduced on the premise of ensuring the picture quality.
Description
Technical Field
The present application relates to the field of image compression technologies, and in particular, to a method and a system for compressing a PNG image.
Background
At present, with the rapid development of multimedia and communication technologies, the information age has brought about "information explosion" and has increased the amount of data, so that data needs to be compressed efficiently regardless of transmission or storage. Image compression is the application of data compression techniques to digital images with the goal of reducing redundant information in the image data so that the data can be stored and transmitted in a more efficient format. By using image compression, the burden of image storage and transmission can be reduced, and the images can be rapidly transmitted and processed in real time on the network. The image compression may be lossy data compression or lossless data compression.
In the prior art, a PNG picture is in a lossless compression picture format, and the PNG picture adopts a storage structure of a 4 (ARGB) channel and a 32-bit bitmap, and needs an RGB color mode to be added with an Alpha (Alpha) channel; the pictures in the JPEG format adopt a storage structure of a 3-channel 24-bit map, and because the pictures in the PNG format use one Alpha (Alpha) channel more than the pictures in the JPEG format, each pixel point uses 8-bit storage space more, the pictures in the same resolution PNG format are larger than the storage space occupied by the JPEG format. The Alpha Channel (Alpha Channel) is a transparency attribute of the pixel point, and refers to the transparency and translucency of a picture, and the value is between 0 (full transparency) and 255 (non-transparency). PNG pictures are a common picture format, and it is very important how to obtain PNG pictures with high quality and high compression ratio.
Disclosure of Invention
The application aims to provide a compression method and a compression system for a PNG picture, and the compression method reduces the storage space occupied by the PNG picture on the premise of ensuring the picture quality.
The application provides a method for compressing a PNG picture, which comprises the following steps: receiving a PNG picture to be compressed; judging whether the received PNG picture has an alpha channel, if so, acquiring a transparency value of the alpha channel, otherwise, terminating the flow; judging whether the received PNG picture belongs to a picture which is allowed to be compressed or not according to the transparency value, if so, compressing the picture, otherwise, terminating the flow;
the method for compressing the picture comprises the following steps: removing an alpha channel of the picture which is allowed to be compressed, and compressing the picture; and saving the compressed PNG picture.
The above, wherein, the method for obtaining transparency value of alpha channel comprises: sequentially traversing from the 1 st pixel point of the picture to be compressed to the m x n pixel points to obtain the transparency value of each pixel point; wherein m represents the number of rows of the pixel points of the picture to be compressed, and n represents the number of columns of the pixel points of the picture to be compressed.
As above, the method for determining whether the received PNG picture belongs to a picture allowed to be compressed according to the transparency value includes: judging whether the transparency value of each pixel point is 0 or 255; if the transparency values of all pixel points of the picture to be compressed are 0 or 255, the picture to be compressed belongs to a picture which is allowed to be compressed; if the transparency value of at least one pixel point of the picture to be compressed is 1 to 254, the picture to be compressed belongs to the picture which is forbidden to be compressed.
As above, if the transparency values of all the pixel points of the picture to be compressed are 0, the alpha channel of the picture to be compressed is directly removed, and then the picture with the alpha channel removed is stored.
As above, if the transparency values of all the pixel points of the picture to be compressed are 255, the alpha channel of the picture to be compressed is directly removed, and then the picture with the alpha channel removed is stored.
In the above, if the transparency values of all the pixels in the picture to be compressed have both 0 and 255, replacing the color values of all the pixels with the transparency value of 255 with a color value that does not appear in the picture; and (4) directly removing an alpha channel from the pixel point with the transparency value of 0, and then storing the picture.
As above, the method for determining whether the picture to be compressed has an alpha channel includes:
and acquiring a color type value of the picture to be compressed, wherein if the color type value is 6, the picture to be compressed has an alpha channel.
The present application also provides a compression system of a PNG picture, the system including: the picture import module is used for receiving an imported PNG picture to be compressed; the first judging module is used for judging whether the received picture has an alpha channel; the traversal module is used for acquiring a transparency value of an alpha channel; the second judgment module is used for judging whether the received picture belongs to a picture which is allowed to be compressed or not according to the transparency value; the image compression module is used for removing an alpha channel of the image which is allowed to be compressed to realize the compression of the image; and the picture storage module is used for storing the PNG picture after the alpha channel is removed.
The traversal module is configured to sequentially traverse a 1 st pixel point of the picture to be compressed to an m × n pixel point, and obtain a transparency value of each pixel point; wherein m represents the number of rows of the pixel points of the picture to be compressed, and n represents the number of columns of the pixel points of the picture to be compressed.
As above, the second determining module is configured to: judging whether the transparency value of each pixel point is 0 or 255; if the transparency values of all pixel points of the picture to be compressed are 0 or 255, the picture to be compressed belongs to a picture which is allowed to be compressed; if the transparency value of at least one pixel point of the picture to be compressed is 1 to 254, the picture to be compressed belongs to the picture which is forbidden to be compressed.
The beneficial effect that this application realized is as follows:
(1) According to the method and the device, the alpha channel of the PNG picture is removed from the picture meeting the compression requirement, so that the 32-bit storage mode is changed into the 24-bit storage mode, and the storage space occupied by the PNG picture is reduced.
(2) Whether this application has the alpha passageway to PNG picture before compressing the PNG picture and judges the PNG picture, avoids not having the PNG picture of alpha passageway to traverse, judges whether it belongs to the picture that can compress, has avoided the unnecessary flow, has improved compression efficiency.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments described in the present application, and other drawings can be obtained by those skilled in the art according to the drawings.
Fig. 1 is a flowchart of a PNG picture compression method according to an embodiment of the present application.
Fig. 2 is a schematic structural diagram of a PNG picture compression system according to an embodiment of the present application.
Reference numerals are as follows: 10. a picture importing module; 20. a first judgment module; 30. traversing the module; 40. a second judgment module; 50. a picture compression module; 60. a picture saving module; 100. compression system of PNG picture.
Detailed Description
The technical solutions in the embodiments of the present application are clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some, but not all, embodiments of the present application. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
Example one
As shown in fig. 1, the present application provides a method for compressing a PNG picture, which includes the following steps:
step S1, receiving a PNG picture to be compressed.
And S2, judging whether the PNG picture has an alpha channel, if so, acquiring transparency information of the alpha channel, and otherwise, terminating the process.
Specifically, whether the PNG picture contains transparency information is judged according to the color type ColorType value or the bit depth of the PNG picture.
If the color type ColorType value of the PNG picture is 6, the PNG picture is a true color image with an alpha channel and includes transparency information.
If the bit depth value of the PNG picture is 32, the PNG picture contains transparency information, otherwise, the PNG picture does not contain transparency information.
The number of the pixels of the PNG picture is m × n, namely, the pixels in m rows and n columns, wherein m and n are integers larger than 1, the value range of the transparency value alpha of each pixel is [0,255], the transparency values of each pixel may be the same or different, if the transparency value of a certain pixel is 0, the pixel is transparent, if the transparency value of a certain pixel is 255, the pixel is opaque, and if the transparency value of a certain pixel is between 1 and 254, the pixel is in a semitransparent state.
And S3, judging whether the input PNG picture belongs to a picture which is allowed to be compressed or not according to the transparency information, if so, executing a compression process of the PNG picture, otherwise, terminating the process and forbidding the execution of the compression process of the PNG picture.
Traversing from the 1 st pixel point of the PNG picture to obtain the transparency value alpha of the pixel point, if the transparency value alpha belongs to the range which allows the PNG picture to be compressed, continuously traversing the next pixel point of the PNG picture, otherwise, terminating the traversing and forbidding the traversed picture to be compressed; sequentially traversing to the m × n pixel points according to the method, if the transparency values alpha of all the pixel points belong to the range allowing the PNG picture to be compressed, judging that the PNG picture can be compressed and executing a compression method; otherwise, compression is prohibited.
The data table comprises transparency values allowing the PNG picture to be compressed, the transparency values alpha =0 and alpha =255 belong to values allowing the PNG picture to be compressed, any value between 1 and 254 of the transparency values alpha does not belong to a value allowing the PNG picture to be compressed, and the picture is stored in a mode of reserving 4 channels.
And comparing the obtained transparency value of the pixel point with the transparency value contained in the data table and allowing the PNG picture to be compressed, wherein if the obtained transparency value of the pixel point belongs to the transparency values stored in the data table, the transparency value of the pixel point is the transparency value allowing the PNG picture to be compressed, otherwise, the transparency value of the pixel point is the transparency value not allowing the PNG picture to be compressed.
Specifically, traversing the ith pixel point of the PNG picture to obtain the transparency value alpha of the ith pixel point; wherein, the value range of i is [1, m × n ];
judging whether the transparency value alpha of the ith pixel point belongs to a value allowing the picture to be compressed or not, if not, ending traversal, and outputting a display result forbidding the PNG picture to be compressed; if yes, executing the next step;
traversing the (i + 1) th pixel point, judging whether the transparency value alpha belongs to a value allowing the picture to be compressed, if not, ending the traversal, and outputting a display result forbidding the PNG picture to be compressed; if yes, the traversal process is circulated until the mth pixel points are traversed, if the pixel values of the mth pixel points belong to the values allowing the picture to be compressed, the picture is allowed to be compressed, and if not, the display result prohibiting the PNG picture from being compressed is output.
The compression method of the PNG picture comprises the following steps:
if the PNG picture belongs to the compressible picture type, removing an alpha channel of the PNG picture;
and after removing an alpha channel of the PNG picture, selecting a storage type of the picture, compressing the picture after the stored quality value is large and small, and storing the compressed picture.
If the transparency values Alpha of all the pixel points in the PNG picture are all 255, an Alpha (Alpha) channel is directly removed, the channel is changed into 3-channel storage, and the storage space occupied by the PNG picture is reduced by about 25%.
If the transparency values Alpha of all the pixel points in the PNG picture are judged to be 0, an Alpha (Alpha) channel is directly removed, 3-channel storage is changed, and the storage space occupied by the PNG picture is reduced by about 25%.
If the transparency values alpha of all the pixel points in the PNG picture are judged to be 0 or 255, then:
if the transparency value alpha of the ith pixel point of the PNG picture is 255, acquiring a color value delta which does not appear in the PNG picture, and replacing the color value delta with the color value of the ith pixel point in the PNG picture;
if the transparency value alpha of the ith pixel point in the PNG picture is judged to be 0, the color of the pixel point does not need to be replaced; and directly removing an alpha channel of the PNG picture, and then storing the picture to realize the compression of the PNG picture.
Example two
As shown in fig. 2, a PNG picture compression system 100 includes:
and the picture importing module 10 is configured to receive an imported PNG picture to be compressed.
The first determining module 20 is configured to determine whether the received picture has an alpha channel.
And the traversing module 30 is configured to obtain a transparency value of an alpha channel.
And the second judging module 40 is configured to judge whether the received picture belongs to a picture that is allowed to be compressed according to the transparency value.
And the picture compression module 50 is configured to remove an alpha channel of the picture that is allowed to be compressed, so as to implement compression of the picture.
And the picture saving module 60 is configured to save the PNG picture after the alpha channel is removed.
And the traversal module 30 is configured to sequentially traverse the 1 st pixel point of the picture to be compressed to the m × n pixel points, and obtain a transparency value of each pixel point.
Wherein m represents the number of rows of the pixel points of the picture to be compressed, and n represents the number of columns of the pixel points of the picture to be compressed.
The second judging module 40 is configured to judge whether the transparency value of each pixel is 0 or 255; if the transparency values of all pixel points of the picture to be compressed are 0 or 255, the picture to be compressed belongs to a picture which is allowed to be compressed; if the transparency value of at least one pixel point of the picture to be compressed is 1 to 254, the picture to be compressed belongs to the picture which is forbidden to be compressed.
The method further comprises an obtaining module, which is used for obtaining the ColorType value of the color type of the picture to be compressed or the bit depth of the PNG picture.
The first determining module 20 determines whether the picture has an alpha channel according to the color type value or the bit depth obtained by the obtaining module.
The beneficial effect that this application realized is as follows:
(1) According to the method and the device, the alpha channel of the PNG picture is removed from the picture meeting the compression requirement, so that the 32-bit storage mode is changed into the 24-bit storage mode, and the storage space occupied by the PNG picture is reduced.
(2) According to the method and the device, whether the PNG picture has the alpha channel or not is judged before the PNG picture is compressed, traversal of the PNG picture without the alpha channel is avoided, whether the PNG picture belongs to the compressible picture or not is judged, unnecessary processes are avoided, and the compression efficiency is improved.
Although one embodiment of the present invention has been described in detail, the description is only for the purpose of illustrating the preferred embodiments of the present invention and should not be taken as limiting the scope of the invention. All equivalent changes and modifications made within the scope of the present invention shall fall within the scope of the present invention.
Claims (7)
1. A method for compressing a PNG picture, the method comprising:
receiving a PNG picture to be compressed;
judging whether the received PNG picture has an alpha channel, if so, acquiring a transparency value of the alpha channel, otherwise, terminating the flow; judging whether the PNG picture has an alpha channel or not according to the color type value or the bit depth of the PNG picture;
judging whether the received PNG picture belongs to a picture which is allowed to be compressed or not according to the transparency value, if so, compressing the picture, otherwise, terminating the flow;
the method for compressing the picture comprises the following steps:
removing an alpha channel of the picture which is allowed to be compressed, and compressing the picture;
saving the compressed PNG picture;
the method for judging whether the received PNG picture belongs to the picture which is allowed to be compressed according to the transparency value comprises the following steps:
judging whether the transparency value of each pixel point is 0 or 255;
if the transparency values of all pixel points of the picture to be compressed are 0 or 255, the picture to be compressed belongs to a picture which is allowed to be compressed;
if the transparency value of at least one pixel point of the picture to be compressed is 1 to 254, the picture to be compressed belongs to a picture which is forbidden to be compressed;
if the transparency values of all pixel points of the picture to be compressed are both 0 and 255, replacing the color values of all the pixel points with the transparency value of 255 by using a color value which does not appear in the picture; and (4) directly removing an alpha channel from the pixel point with the transparency value of 0, and then storing the picture.
2. The PNG picture compression method according to claim 1, wherein the method of obtaining transparency values of an alpha channel comprises:
sequentially traversing from the 1 st pixel point of the picture to be compressed to the m x n pixel points to obtain the transparency value of each pixel point;
wherein m represents the number of rows of the pixel points of the picture to be compressed, and n represents the number of columns of the pixel points of the picture to be compressed.
3. The PNG picture compression method according to claim 1, wherein if the transparency values of all the pixel points of the picture to be compressed are 0, the alpha channel of the picture to be compressed is directly removed, and then the picture from which the alpha channel is removed is stored.
4. The PNG picture compression method according to claim 1, wherein if the transparency values of all the pixels of the picture to be compressed are 255, the alpha channel of the picture to be compressed is directly removed, and then the picture from which the alpha channel is removed is stored.
5. The method of claim 1, wherein the method of determining whether the picture to be compressed has an alpha channel is as follows:
and acquiring a color type value of the picture to be compressed, wherein if the color type value is 6, the picture to be compressed has an alpha channel.
6. A PNG picture compression system, comprising:
the picture import module is used for receiving an imported PNG picture to be compressed;
the first judging module is used for judging whether the received picture has an alpha channel or not;
the traversal module is used for acquiring transparency values of alpha channels; judging whether the PNG picture has an alpha channel or not according to the color type value or the bit depth of the PNG picture;
the second judgment module is used for judging whether the received picture belongs to a picture which is allowed to be compressed or not according to the transparency value;
the image compression module is used for removing an alpha channel of the image which is allowed to be compressed to realize the compression of the image;
the picture storage module is used for storing the PNG picture after the alpha channel is removed;
the second judging module is configured to:
judging whether the transparency value of each pixel point is 0 or 255;
if the transparency values of all pixel points of the picture to be compressed are 0 or 255, the picture to be compressed belongs to a picture which is allowed to be compressed;
if the transparency value of at least one pixel point of the picture to be compressed is 1 to 254, the picture to be compressed belongs to a picture which is forbidden to be compressed;
if the transparency values of all pixel points of the picture to be compressed are both 0 and 255, replacing the color values of all the pixel points with the transparency value of 255 by using a color value which does not appear in the picture; and (4) directly removing an alpha channel from the pixel point with the transparency value of 0, and then storing the picture.
7. The PNG picture compression system according to claim 6,
the traversal module is used for sequentially traversing the 1 st pixel point of the picture to be compressed to the m × n pixel points to obtain the transparency value of each pixel point;
wherein m represents the number of rows of the pixel points of the picture to be compressed, and n represents the number of columns of the pixel points of the picture to be compressed.
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| CN115550661B (en) * | 2022-11-25 | 2023-03-24 | 统信软件技术有限公司 | Image compression method, restoration method, computing device and readable storage medium |
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